The making of 'Naked' was an absolutely phenomenal, mind-bending experience. That film was life-changing and put my career onto a whole different level.

I'd had a relationship with a French girl, a Japanese girl, an American girl, a Filippina and she was there all the time - a Lancashire girl. I thought: 'It's a Lancashire girl I was looking for. Why didn't I realize it?

I keep myself content by doing lots of different stuff and make sure that my next role is completely different to the last. I just enjoy the versatility of it, the challenge of doing lots of different things. It keeps the job interesting.

I walk to Oxford Street and climb on the number 8. It's freezing and it starts to rain and it's the ugliest bus I've ever seen, rattling down the ugliest streets, in the ugliest city, in the ugliest country, in the ugliest of all possible worlds.

Alfonso Cuarón, in the rehearsals, without J.K. Rowling's knowledge, told me that [my character] was, in fact, gay. So I'd been playing a part like a gay man for quite a long time. Until it turned out that I indeed got married to Tonks. I changed my whole performance after that. Just saw it as a phase he went through.

When you do something well, this is the best job in the world.

I'd been a stepparent for about two years with a woman who had a child, and I came to realize I adored children and was good with them. So I was very happy when Anna got pregnant.